Stones

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Stones last won the day on May 3

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  1. This is really a very important point - the law of diminishing returns. As you say, significant gains possible from small investments. I can't think of anything I've read in the climate debate which considers that.
  2. My understanding was that the attraction of 'green' hydrogen production was the use of 'excess' electricity production generated by renewables. As more renewables are brought online, so the potential for more excess, and rather than turning the turbines off, you use that extra energy to produce hydrogen, which should in theory, bring the cost of it down. On the lobbying side, we have just returned from holiday, back to Glasgow airport. The first thing you see when you walk out of customs through the arrivals door is a huge hoarding promoting Hydrogen (sponsored by Ineos, who have of course just announced a £2bn investment)
  3. Well done! I made my own silencer for the same reasons as you, and it has proved very effective. Didn't think of the multi holed baffles. Has it reduced air flow at all?
  4. We have a 300l UVC heated by a 8.3kW ASHP, water heated to and stored at 48C, legionella cycle every 3 weeks to take it over 60C. Similar pattern of use, 2 long showers in the morning, 2 in the evening. We can comfortably run a deep bath and run one shower from the tank before it runs cool. Showers flow at 16l/m. We have never run out of hot water. Your main challenges are recovery time, i.e. how long to heat the UVC up - with an ASHP it will take longer and therefore a bigger (300l) UVC makes sense. Previous experience from a rented property with a 200l UVC was it always ran cold after two showers, and being direct electric took ages to recover. Second challenge is when you choose to heat the UVC - if you only heat during the night, e.g. E7, then ideally you'd be looking to heat all your water then and need to store enough until the next heating cycle, and therefore a bigger (400l+) UVC. Top it up through the day and you can reduce the size. And just to add another variable, are you planning solar thermal or PV?
  5. We had a low temp radiator system running off a heat pump in our last house. Radiators were a lot bigger (surface area) compared to the size required for gas/oil system. Pipework was IIRC 22mm ring with 15mm feeding each radiator. Microbore would in my view need replacing. The customer feedback above is I think a little misleading - unhappy with heat - what exactly do they mean? Are they are trying to use a HP system like a gas boiler only coming on for a couple of hours in the morning/evening? Living with a low temp system is very different to a gas/oil rapid response system.
  6. @Sketching Do you have the heating set to a timer - as you would a gas or oil system, or are you letting the heating come on/off as it needs 24/7 ?
  7. We have Rational windows and very happy with them. In for 5 years now and look as good as new. Around a year after they were installed, a couple of guys from the supplier visited as they were in our area and had a quick check of everything. The biggest issue they said they normally encountered was, as you say, lack of maintenance, especially the hardware/opening mechanisms etc. I've religiously made a point of twice a year cleaning and lubricating everything I can get to with a PTFE spray.
  8. Possible, yes. Our last house we had low temp radiator system running from a heat pump. There's nothing special about the radiators, other than they have to be a lot bigger compared to your usual gas or oil system. In our case they were roughly 4 times the size (surface area). Pipework feeding also needed to be 15 or 22 mm (sorry, can't remember which) - microbore simply would not work. Our system ran at a flow temp of 33C at 0C ambient, but that was a new, very well insulated house.
  9. I see the government is proposing shifting green levies onto gas: https://www.ft.com/content/54b437ad-4683-434e-89aa-e26772092b31
  10. It also wants to weaken it's neighbours, especially Ukraine, so rather than upgrading the existing pipeline through Ukraine and Poland and negotiating better payment deals, it has built a new pipeline it will control. All the new pipeline will do is divert supply from the old to the new.
  11. Regardless of what the method of generation is, a 'fuel' source is needed - sun, wind, tides, current, water flow (and geography), gas, oil, coal, uranium etc. Where we cannot guarantee a continuous and uninterrupted supply, some form of storage is needed to help smooth out the peaks and troughs. What strikes me as odd in the push to switch over to more renewables is that there has not been a corresponding investment in storage capacity (or research into developing) of the electricity generated by solar and wind. @SteamyTea mentioned compressed air storage which I've read a couple of articles on, and on the face of it, could be one of several solutions. 'Green' Hydrogen is another, albeit round trip efficiency isn't great (though that may not really matter if the generated electricity is surplus/excess).
  12. None of that seems unreasonable. Our neighbours tank and soakaway lies on our land. When we purchased, provision was made covering access and reinstatement should any works be required. Straightforward for a solicitor to draft for you. Have you agreed to do it all via solicitors and who is picking up costs?
  13. From what I remember when I looked, it was less than slate, but a lot more than concrete tile. One of the installation details was it had to be laid on 18mm board and breather membrane. Also depends on the roof, the sq m price of the sheeting seems reasonable but the cost of flashings adds up.
  14. A lot of truth in this I think. Also true that around 80% of journeys are short / local. An EV is ideal for this. Longer range I'm less convinced in the absence of fast charging (comparable to filling up with fuel). I can accept the argument that you stop and have a coffee while you charge. What the proponents seem to gloss over is the queue of others behind waiting to charge, which will happen when we have all switched to EV's. Easy solution is more charging points, but how many do you need to effectively replace fuel pumps given it takes longer to 'fuel' an EV? Given we can make carbon neutral synthetic fuels, I'm a little puzzled why Hybrids are not part of the future, as I'm positive synthetic fuels will be used in heavy goods vehicles and alike. The other thing that doesn't get much press is the lifecycle carbon emissions of an EV. I've read a few comparison studies and the carbon reductions all come from the decarbonisation of the energy used to make the batteries, and recycling them into another use thereafter. The gap at the moment is only a few %. If your battery production is powered by renewable energy then fine, but if the batteries come from China? Interestingly, the lifecycle carbon emissions of an EV with a longer range, i.e. more batteries, gets worse, which is why I assume they select EV's with a 100 mile odd range for their comparisons. Can't help but feel that once they have encouraged the switch, in years to come we'll all be labelled planet killers for buying an EV, much in the same way diesel is demonised today. Lastly, does anyone seriously think EV's will remain cheap to run? The govt will have a huge fuel duty hole in its finances to make up. Road pricing here we come!